Actually, I doubt any of those models would go for current retail. What most mean when they say they can get 'new' price or that their watch appreciates is if you hold onto the watch for several years (and thru several price increases) the new prices will rise, which with it brings the used prices up. So if you paid $5,000 for the sub say 2 years ago, and in 4 more years it's selling for say $7,200, then you can probably sell the watch for the same, or more, than you have in it - the $5,000. You probably will not get the $7,200 or more a new off the floor one would be - unless that model is impossible to get (think Daytona). With the exception of a few models (such as the Daytona) where demand far exceeds supply, you won't be able to get the current new price for a used Rolex.
Yes, you may see them being offered at more than MSRP, but that doesn't mean people are buying them for those prices. Example, do a search on ebay for LV Sub. I found 13 for sale. All but 2 have a price over the MSRP. But not 1 had a bid - zero.
A Milguass you can probably get more on right now as supply is still tight as it's still new. Same with the GMT IIc, though supplies are leveling on that one. The LV was hot a couple years ago, but demand has cooled - or supply increased because I can now find one with little effort in an AD. I'd be surprised to find many buying a preowned above or near retail now.